SemaStmt.cpp revision 390b4cc8b45a05612349269ef08faab3e4688f06
15ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark//===--- SemaStmt.cpp - Semantic Analysis for Statements ------------------===// 2d0825bca7fe65beaee391d30da42e937db621564Steve Block// 35ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark// The LLVM Compiler Infrastructure 45ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark// 55ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark// This file is distributed under the University of Illinois Open Source 65ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark// License. See LICENSE.TXT for details. 75ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark// 85ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark//===----------------------------------------------------------------------===// 95ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark// 105ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark// This file implements semantic analysis for statements. 115ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark// 125ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark//===----------------------------------------------------------------------===// 135ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 145ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark#include "Sema.h" 155ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark#include "clang/AST/APValue.h" 165ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark#include "clang/AST/ASTContext.h" 175ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark#include "clang/AST/DeclObjC.h" 185ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark#include "clang/AST/Expr.h" 195ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark#include "clang/AST/StmtObjC.h" 205ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark#include "clang/AST/StmtCXX.h" 215ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark#include "clang/Basic/TargetInfo.h" 225ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clarkusing namespace clang; 235ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 245ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkSema::OwningStmtResult Sema::ActOnExprStmt(ExprArg expr) { 255ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Expr *E = expr.takeAs<Expr>(); 265ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark assert(E && "ActOnExprStmt(): missing expression"); 275ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 285ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // C99 6.8.3p2: The expression in an expression statement is evaluated as a 295ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // void expression for its side effects. Conversion to void allows any 305ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // operand, even incomplete types. 315ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 325ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // Same thing in for stmt first clause (when expr) and third clause. 33dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block return Owned(static_cast<Stmt*>(E)); 345ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark} 355ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 365ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 37231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve BlockSema::OwningStmtResult Sema::ActOnNullStmt(SourceLocation SemiLoc) { 385ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return Owned(new (Context) NullStmt(SemiLoc)); 395ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark} 405ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 415ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkSema::OwningStmtResult Sema::ActOnDeclStmt(DeclGroupPtrTy dg, 425ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark SourceLocation StartLoc, 43231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block SourceLocation EndLoc) { 448a0914b749bbe7da7768e07a7db5c6d4bb09472bSteve Block DeclGroupRef DG = dg.getAsVal<DeclGroupRef>(); 45231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block 46231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block // If we have an invalid decl, just return an error. 47231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block if (DG.isNull()) return StmtError(); 485ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 495ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return Owned(new (Context) DeclStmt(DG, StartLoc, EndLoc)); 505ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark} 515ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 520bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben MurdochAction::OwningStmtResult 53231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve BlockSema::ActOnCompoundStmt(SourceLocation L, SourceLocation R, 545ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark MultiStmtArg elts, bool isStmtExpr) { 555ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark unsigned NumElts = elts.size(); 56231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block Stmt **Elts = reinterpret_cast<Stmt**>(elts.release()); 57231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block // If we're in C89 mode, check that we don't have any decls after stmts. If 58231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block // so, emit an extension diagnostic. 590bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if (!getLangOptions().C99 && !getLangOptions().CPlusPlus) { 60231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block // Note that __extension__ can be around a decl. 615ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark unsigned i = 0; 62231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block // Skip over all declarations. 63dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block for (; i != NumElts && isa<DeclStmt>(Elts[i]); ++i) 645ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark /*empty*/; 655ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 665ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // We found the end of the list or a statement. Scan for another declstmt. 675ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark for (; i != NumElts && !isa<DeclStmt>(Elts[i]); ++i) 685ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark /*empty*/; 695ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 705ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (i != NumElts) { 715ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Decl *D = *cast<DeclStmt>(Elts[i])->decl_begin(); 725ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Diag(D->getLocation(), diag::ext_mixed_decls_code); 735ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 745ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 755ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // Warn about unused expressions in statements. 765ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark for (unsigned i = 0; i != NumElts; ++i) { 77d0825bca7fe65beaee391d30da42e937db621564Steve Block Expr *E = dyn_cast<Expr>(Elts[i]); 785ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (!E) continue; 79d0825bca7fe65beaee391d30da42e937db621564Steve Block 80d0825bca7fe65beaee391d30da42e937db621564Steve Block // Warn about expressions with unused results if they are non-void and if 81d0825bca7fe65beaee391d30da42e937db621564Steve Block // this not the last stmt in a stmt expr. 82d0825bca7fe65beaee391d30da42e937db621564Steve Block if (E->getType()->isVoidType() || (isStmtExpr && i == NumElts-1)) 83d0825bca7fe65beaee391d30da42e937db621564Steve Block continue; 84d0825bca7fe65beaee391d30da42e937db621564Steve Block 85d0825bca7fe65beaee391d30da42e937db621564Steve Block SourceLocation Loc; 86d0825bca7fe65beaee391d30da42e937db621564Steve Block SourceRange R1, R2; 87d0825bca7fe65beaee391d30da42e937db621564Steve Block if (!E->isUnusedResultAWarning(Loc, R1, R2)) 88d0825bca7fe65beaee391d30da42e937db621564Steve Block continue; 89d0825bca7fe65beaee391d30da42e937db621564Steve Block 90d0825bca7fe65beaee391d30da42e937db621564Steve Block Diag(Loc, diag::warn_unused_expr) << R1 << R2; 915ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 925ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 935ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return Owned(new (Context) CompoundStmt(Context, Elts, NumElts, L, R)); 940bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch} 955ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 965ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkAction::OwningStmtResult 975ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkSema::ActOnCaseStmt(SourceLocation CaseLoc, ExprArg lhsval, 985ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark SourceLocation DotDotDotLoc, ExprArg rhsval, 99d0825bca7fe65beaee391d30da42e937db621564Steve Block SourceLocation ColonLoc) { 100d0825bca7fe65beaee391d30da42e937db621564Steve Block assert((lhsval.get() != 0) && "missing expression in case statement"); 1010bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch 1025ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // C99 6.8.4.2p3: The expression shall be an integer constant. 1035ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // However, GCC allows any evaluatable integer expression. 104692e5dbf12901edacf14812a6fae25462920af42Steve Block Expr *LHSVal = static_cast<Expr*>(lhsval.get()); 105692e5dbf12901edacf14812a6fae25462920af42Steve Block if (!LHSVal->isTypeDependent() && !LHSVal->isValueDependent() && 106692e5dbf12901edacf14812a6fae25462920af42Steve Block VerifyIntegerConstantExpression(LHSVal)) 107692e5dbf12901edacf14812a6fae25462920af42Steve Block return StmtError(); 108692e5dbf12901edacf14812a6fae25462920af42Steve Block 109692e5dbf12901edacf14812a6fae25462920af42Steve Block // GCC extension: The expression shall be an integer constant. 110692e5dbf12901edacf14812a6fae25462920af42Steve Block 111692e5dbf12901edacf14812a6fae25462920af42Steve Block Expr *RHSVal = static_cast<Expr*>(rhsval.get()); 112692e5dbf12901edacf14812a6fae25462920af42Steve Block if (RHSVal && !RHSVal->isTypeDependent() && !RHSVal->isValueDependent() && 113692e5dbf12901edacf14812a6fae25462920af42Steve Block VerifyIntegerConstantExpression(RHSVal)) { 114692e5dbf12901edacf14812a6fae25462920af42Steve Block RHSVal = 0; // Recover by just forgetting about it. 115692e5dbf12901edacf14812a6fae25462920af42Steve Block rhsval = 0; 116692e5dbf12901edacf14812a6fae25462920af42Steve Block } 117692e5dbf12901edacf14812a6fae25462920af42Steve Block 118692e5dbf12901edacf14812a6fae25462920af42Steve Block if (getSwitchStack().empty()) { 119692e5dbf12901edacf14812a6fae25462920af42Steve Block Diag(CaseLoc, diag::err_case_not_in_switch); 120dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block return StmtError(); 121dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block } 122dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block 123692e5dbf12901edacf14812a6fae25462920af42Steve Block // Only now release the smart pointers. 124692e5dbf12901edacf14812a6fae25462920af42Steve Block lhsval.release(); 125692e5dbf12901edacf14812a6fae25462920af42Steve Block rhsval.release(); 126692e5dbf12901edacf14812a6fae25462920af42Steve Block CaseStmt *CS = new (Context) CaseStmt(LHSVal, RHSVal, CaseLoc, DotDotDotLoc, 127692e5dbf12901edacf14812a6fae25462920af42Steve Block ColonLoc); 128692e5dbf12901edacf14812a6fae25462920af42Steve Block getSwitchStack().back()->addSwitchCase(CS); 129692e5dbf12901edacf14812a6fae25462920af42Steve Block return Owned(CS); 130692e5dbf12901edacf14812a6fae25462920af42Steve Block} 131692e5dbf12901edacf14812a6fae25462920af42Steve Block 132692e5dbf12901edacf14812a6fae25462920af42Steve Block/// ActOnCaseStmtBody - This installs a statement as the body of a case. 133692e5dbf12901edacf14812a6fae25462920af42Steve Blockvoid Sema::ActOnCaseStmtBody(StmtTy *caseStmt, StmtArg subStmt) { 134692e5dbf12901edacf14812a6fae25462920af42Steve Block CaseStmt *CS = static_cast<CaseStmt*>(caseStmt); 135692e5dbf12901edacf14812a6fae25462920af42Steve Block Stmt *SubStmt = subStmt.takeAs<Stmt>(); 136692e5dbf12901edacf14812a6fae25462920af42Steve Block CS->setSubStmt(SubStmt); 137692e5dbf12901edacf14812a6fae25462920af42Steve Block} 138692e5dbf12901edacf14812a6fae25462920af42Steve Block 139692e5dbf12901edacf14812a6fae25462920af42Steve BlockAction::OwningStmtResult 140692e5dbf12901edacf14812a6fae25462920af42Steve BlockSema::ActOnDefaultStmt(SourceLocation DefaultLoc, SourceLocation ColonLoc, 141692e5dbf12901edacf14812a6fae25462920af42Steve Block StmtArg subStmt, Scope *CurScope) { 142692e5dbf12901edacf14812a6fae25462920af42Steve Block Stmt *SubStmt = subStmt.takeAs<Stmt>(); 143692e5dbf12901edacf14812a6fae25462920af42Steve Block 144692e5dbf12901edacf14812a6fae25462920af42Steve Block if (getSwitchStack().empty()) { 145692e5dbf12901edacf14812a6fae25462920af42Steve Block Diag(DefaultLoc, diag::err_default_not_in_switch); 146692e5dbf12901edacf14812a6fae25462920af42Steve Block return Owned(SubStmt); 147692e5dbf12901edacf14812a6fae25462920af42Steve Block } 148692e5dbf12901edacf14812a6fae25462920af42Steve Block 149692e5dbf12901edacf14812a6fae25462920af42Steve Block DefaultStmt *DS = new (Context) DefaultStmt(DefaultLoc, ColonLoc, SubStmt); 150692e5dbf12901edacf14812a6fae25462920af42Steve Block getSwitchStack().back()->addSwitchCase(DS); 151692e5dbf12901edacf14812a6fae25462920af42Steve Block return Owned(DS); 152692e5dbf12901edacf14812a6fae25462920af42Steve Block} 153692e5dbf12901edacf14812a6fae25462920af42Steve Block 154692e5dbf12901edacf14812a6fae25462920af42Steve BlockAction::OwningStmtResult 155692e5dbf12901edacf14812a6fae25462920af42Steve BlockSema::ActOnLabelStmt(SourceLocation IdentLoc, IdentifierInfo *II, 156692e5dbf12901edacf14812a6fae25462920af42Steve Block SourceLocation ColonLoc, StmtArg subStmt) { 157692e5dbf12901edacf14812a6fae25462920af42Steve Block Stmt *SubStmt = subStmt.takeAs<Stmt>(); 158692e5dbf12901edacf14812a6fae25462920af42Steve Block // Look up the record for this label identifier. 159692e5dbf12901edacf14812a6fae25462920af42Steve Block LabelStmt *&LabelDecl = getLabelMap()[II]; 160692e5dbf12901edacf14812a6fae25462920af42Steve Block 161692e5dbf12901edacf14812a6fae25462920af42Steve Block // If not forward referenced or defined already, just create a new LabelStmt. 162692e5dbf12901edacf14812a6fae25462920af42Steve Block if (LabelDecl == 0) 163692e5dbf12901edacf14812a6fae25462920af42Steve Block return Owned(LabelDecl = new (Context) LabelStmt(IdentLoc, II, SubStmt)); 164692e5dbf12901edacf14812a6fae25462920af42Steve Block 165692e5dbf12901edacf14812a6fae25462920af42Steve Block assert(LabelDecl->getID() == II && "Label mismatch!"); 166692e5dbf12901edacf14812a6fae25462920af42Steve Block 167692e5dbf12901edacf14812a6fae25462920af42Steve Block // Otherwise, this label was either forward reference or multiply defined. If 168692e5dbf12901edacf14812a6fae25462920af42Steve Block // multiply defined, reject it now. 169692e5dbf12901edacf14812a6fae25462920af42Steve Block if (LabelDecl->getSubStmt()) { 170692e5dbf12901edacf14812a6fae25462920af42Steve Block Diag(IdentLoc, diag::err_redefinition_of_label) << LabelDecl->getID(); 171692e5dbf12901edacf14812a6fae25462920af42Steve Block Diag(LabelDecl->getIdentLoc(), diag::note_previous_definition); 172692e5dbf12901edacf14812a6fae25462920af42Steve Block return Owned(SubStmt); 173692e5dbf12901edacf14812a6fae25462920af42Steve Block } 174692e5dbf12901edacf14812a6fae25462920af42Steve Block 175692e5dbf12901edacf14812a6fae25462920af42Steve Block // Otherwise, this label was forward declared, and we just found its real 176692e5dbf12901edacf14812a6fae25462920af42Steve Block // definition. Fill in the forward definition and return it. 177692e5dbf12901edacf14812a6fae25462920af42Steve Block LabelDecl->setIdentLoc(IdentLoc); 178692e5dbf12901edacf14812a6fae25462920af42Steve Block LabelDecl->setSubStmt(SubStmt); 179692e5dbf12901edacf14812a6fae25462920af42Steve Block return Owned(LabelDecl); 180692e5dbf12901edacf14812a6fae25462920af42Steve Block} 181692e5dbf12901edacf14812a6fae25462920af42Steve Block 182692e5dbf12901edacf14812a6fae25462920af42Steve BlockAction::OwningStmtResult 183692e5dbf12901edacf14812a6fae25462920af42Steve BlockSema::ActOnIfStmt(SourceLocation IfLoc, ExprArg CondVal, 184692e5dbf12901edacf14812a6fae25462920af42Steve Block StmtArg ThenVal, SourceLocation ElseLoc, 185dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block StmtArg ElseVal) { 186dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block Expr *condExpr = CondVal.takeAs<Expr>(); 187dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block 188dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block assert(condExpr && "ActOnIfStmt(): missing expression"); 189dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block 190692e5dbf12901edacf14812a6fae25462920af42Steve Block if (!condExpr->isTypeDependent()) { 191dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block DefaultFunctionArrayConversion(condExpr); 192dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block // Take ownership again until we're past the error checking. 193dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block CondVal = condExpr; 194dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block QualType condType = condExpr->getType(); 195692e5dbf12901edacf14812a6fae25462920af42Steve Block 196692e5dbf12901edacf14812a6fae25462920af42Steve Block if (getLangOptions().CPlusPlus) { 197692e5dbf12901edacf14812a6fae25462920af42Steve Block if (CheckCXXBooleanCondition(condExpr)) // C++ 6.4p4 198692e5dbf12901edacf14812a6fae25462920af42Steve Block return StmtError(); 199692e5dbf12901edacf14812a6fae25462920af42Steve Block } else if (!condType->isScalarType()) // C99 6.8.4.1p1 200692e5dbf12901edacf14812a6fae25462920af42Steve Block return StmtError(Diag(IfLoc, 201692e5dbf12901edacf14812a6fae25462920af42Steve Block diag::err_typecheck_statement_requires_scalar) 202692e5dbf12901edacf14812a6fae25462920af42Steve Block << condType << condExpr->getSourceRange()); 203692e5dbf12901edacf14812a6fae25462920af42Steve Block } 204692e5dbf12901edacf14812a6fae25462920af42Steve Block 205692e5dbf12901edacf14812a6fae25462920af42Steve Block Stmt *thenStmt = ThenVal.takeAs<Stmt>(); 206692e5dbf12901edacf14812a6fae25462920af42Steve Block 2075ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // Warn if the if block has a null body without an else value. 2085ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // this helps prevent bugs due to typos, such as 209ca9cb53ed1119a3fd98fafa0972ffeb56dee1c24Steve Block // if (condition); 210ca9cb53ed1119a3fd98fafa0972ffeb56dee1c24Steve Block // do_stuff(); 211231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block if (!ElseVal.get()) { 212231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block if (NullStmt* stmt = dyn_cast<NullStmt>(thenStmt)) 213231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block Diag(stmt->getSemiLoc(), diag::warn_empty_if_body); 214231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block } 2150bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch 2165ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark CondVal.release(); 2175ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return Owned(new (Context) IfStmt(IfLoc, condExpr, thenStmt, 2185ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark ElseLoc, ElseVal.takeAs<Stmt>())); 219563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark} 2205ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 2216c2af9490927c3c5959b5cb07461b646f8b32f6cKristian MonsenAction::OwningStmtResult 2225ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkSema::ActOnStartOfSwitchStmt(ExprArg cond) { 2230bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch Expr *Cond = cond.takeAs<Expr>(); 224563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark 225563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark if (getLangOptions().CPlusPlus) { 226563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark // C++ 6.4.2.p2: 227231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block // The condition shall be of integral type, enumeration type, or of a class 2285ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // type for which a single conversion function to integral or enumeration 2295ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // type exists (12.3). If the condition is of class type, the condition is 2305ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // converted by calling that conversion function, and the result of the 2310bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // conversion is used in place of the original condition for the remainder 2320bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // of this section. Integral promotions are performed. 2330bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if (!Cond->isTypeDependent()) { 2345e2bc6953fe6923165b8a5d7679939693a1d58d6Steve Block QualType Ty = Cond->getType(); 2350bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch 2360bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // FIXME: Handle class types. 2375ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 2385ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // If the type is wrong a diagnostic will be emitted later at 2395ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // ActOnFinishSwitchStmt. 2405ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (Ty->isIntegralType() || Ty->isEnumeralType()) { 241231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block // Integral promotions are performed. 242231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block // FIXME: Integral promotions for C++ are not complete. 243231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block UsualUnaryConversions(Cond); 244231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block } 2455ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 2465ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } else { 24706ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen // C99 6.8.4.2p5 - Integer promotions are performed on the controlling expr. 24806ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen UsualUnaryConversions(Cond); 24906ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen } 25006ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen 25106ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen SwitchStmt *SS = new (Context) SwitchStmt(Cond); 25206ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen getSwitchStack().push_back(SS); 25306ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen return Owned(SS); 2545ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark} 2555ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 2565ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark/// ConvertIntegerToTypeWarnOnOverflow - Convert the specified APInt to have 257563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark/// the specified width and sign. If an overflow occurs, detect it and emit 258563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark/// the specified diagnostic. 259563af33bc48281d19dce701398dbb88cb54fd7ecCary Clarkvoid Sema::ConvertIntegerToTypeWarnOnOverflow(llvm::APSInt &Val, 260231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block unsigned NewWidth, bool NewSign, 261231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block SourceLocation Loc, 262231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block unsigned DiagID) { 263231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block // Perform a conversion to the promoted condition type if needed. 2645ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (NewWidth > Val.getBitWidth()) { 2655ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // If this is an extension, just do it. 266dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block llvm::APSInt OldVal(Val); 2675ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Val.extend(NewWidth); 2680bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch 2690bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // If the input was signed and negative and the output is unsigned, 270dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block // warn. 2710bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if (!NewSign && OldVal.isSigned() && OldVal.isNegative()) 2720bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch Diag(Loc, DiagID) << OldVal.toString(10) << Val.toString(10); 2730bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch 2740bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch Val.setIsSigned(NewSign); 2750bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch } else if (NewWidth < Val.getBitWidth()) { 276dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block // If this is a truncation, check for overflow. 2775ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark llvm::APSInt ConvVal(Val); 2785ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark ConvVal.trunc(NewWidth); 2795ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark ConvVal.setIsSigned(NewSign); 2805ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark ConvVal.extend(Val.getBitWidth()); 2815ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark ConvVal.setIsSigned(Val.isSigned()); 2825ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (ConvVal != Val) 2835ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Diag(Loc, DiagID) << Val.toString(10) << ConvVal.toString(10); 2845ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 2855ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // Regardless of whether a diagnostic was emitted, really do the 2865ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // truncation. 287563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark Val.trunc(NewWidth); 2885ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Val.setIsSigned(NewSign); 2895ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } else if (NewSign != Val.isSigned()) { 2905ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // Convert the sign to match the sign of the condition. This can cause 291563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark // overflow as well: unsigned(INTMIN) 2925ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark llvm::APSInt OldVal(Val); 2935ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Val.setIsSigned(NewSign); 2945ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 295692e5dbf12901edacf14812a6fae25462920af42Steve Block if (Val.isNegative()) // Sign bit changes meaning. 2965ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Diag(Loc, DiagID) << OldVal.toString(10) << Val.toString(10); 297563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark } 298563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark} 299563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark 300563af33bc48281d19dce701398dbb88cb54fd7ecCary Clarknamespace { 301563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark struct CaseCompareFunctor { 302563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, 303563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark const llvm::APSInt &RHS) { 304563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark return LHS.first < RHS; 305563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark } 306563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, 307563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark const std::pair<llvm::APSInt, CaseStmt*> &RHS) { 308563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark return LHS.first < RHS.first; 309231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block } 310563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark bool operator()(const llvm::APSInt &LHS, 311563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark const std::pair<llvm::APSInt, CaseStmt*> &RHS) { 312563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark return LHS < RHS.first; 313563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark } 314563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark }; 315563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark} 316563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark 317563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark/// CmpCaseVals - Comparison predicate for sorting case values. 3185ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark/// 3195ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clarkstatic bool CmpCaseVals(const std::pair<llvm::APSInt, CaseStmt*>& lhs, 3205ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark const std::pair<llvm::APSInt, CaseStmt*>& rhs) { 3215ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (lhs.first < rhs.first) 322563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark return true; 323563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark 324563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark if (lhs.first == rhs.first && 325ca9cb53ed1119a3fd98fafa0972ffeb56dee1c24Steve Block lhs.second->getCaseLoc().getRawEncoding() 326ca9cb53ed1119a3fd98fafa0972ffeb56dee1c24Steve Block < rhs.second->getCaseLoc().getRawEncoding()) 3270bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch return true; 3280bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch return false; 329d0825bca7fe65beaee391d30da42e937db621564Steve Block} 330d0825bca7fe65beaee391d30da42e937db621564Steve Block 331d0825bca7fe65beaee391d30da42e937db621564Steve BlockAction::OwningStmtResult 332d0825bca7fe65beaee391d30da42e937db621564Steve BlockSema::ActOnFinishSwitchStmt(SourceLocation SwitchLoc, StmtArg Switch, 333563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark StmtArg Body) { 3340bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch Stmt *BodyStmt = Body.takeAs<Stmt>(); 3350bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch 3360bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch SwitchStmt *SS = getSwitchStack().back(); 3370bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch assert(SS == (SwitchStmt*)Switch.get() && "switch stack missing push/pop!"); 338563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark 339563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark SS->setBody(BodyStmt, SwitchLoc); 340563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark getSwitchStack().pop_back(); 341563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark 3420bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch Expr *CondExpr = SS->getCond(); 3430bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch QualType CondType = CondExpr->getType(); 344563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark 345563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark if (!CondExpr->isTypeDependent() && 346563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark !CondType->isIntegerType()) { // C99 6.8.4.2p1 347563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark Diag(SwitchLoc, diag::err_typecheck_statement_requires_integer) 3480bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch << CondType << CondExpr->getSourceRange(); 3490bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch return StmtError(); 3500bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch } 3510bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch 3520bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // Get the bitwidth of the switched-on value before promotions. We must 3530bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // convert the integer case values to this width before comparison. 3540bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch bool HasDependentValue 3550bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch = CondExpr->isTypeDependent() || CondExpr->isValueDependent(); 3565ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark unsigned CondWidth 3570bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch = HasDependentValue? 0 3580bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch : static_cast<unsigned>(Context.getTypeSize(CondType)); 3590bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch bool CondIsSigned = CondType->isSignedIntegerType(); 3600bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch 3610bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // Accumulate all of the case values in a vector so that we can sort them 3620bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // and detect duplicates. This vector contains the APInt for the case after 3630bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // it has been converted to the condition type. 3640bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch typedef llvm::SmallVector<std::pair<llvm::APSInt, CaseStmt*>, 64> CaseValsTy; 3650bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch CaseValsTy CaseVals; 3660bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch 3670bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // Keep track of any GNU case ranges we see. The APSInt is the low value. 3680bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch std::vector<std::pair<llvm::APSInt, CaseStmt*> > CaseRanges; 3695ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 3705ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark DefaultStmt *TheDefaultStmt = 0; 3715ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 3725ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark bool CaseListIsErroneous = false; 3735e2bc6953fe6923165b8a5d7679939693a1d58d6Steve Block 3745e2bc6953fe6923165b8a5d7679939693a1d58d6Steve Block for (SwitchCase *SC = SS->getSwitchCaseList(); SC && !HasDependentValue; 3755e2bc6953fe6923165b8a5d7679939693a1d58d6Steve Block SC = SC->getNextSwitchCase()) { 3765e2bc6953fe6923165b8a5d7679939693a1d58d6Steve Block 3775e2bc6953fe6923165b8a5d7679939693a1d58d6Steve Block if (DefaultStmt *DS = dyn_cast<DefaultStmt>(SC)) { 3785e2bc6953fe6923165b8a5d7679939693a1d58d6Steve Block if (TheDefaultStmt) { 3795ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Diag(DS->getDefaultLoc(), diag::err_multiple_default_labels_defined); 3805ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Diag(TheDefaultStmt->getDefaultLoc(), diag::note_duplicate_case_prev); 3815ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 3825ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // FIXME: Remove the default statement from the switch block so that 3835ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // we'll return a valid AST. This requires recursing down the AST and 3845ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // finding it, not something we are set up to do right now. For now, 385563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark // just lop the entire switch stmt out of the AST. 3865ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark CaseListIsErroneous = true; 387563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark } 388563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark TheDefaultStmt = DS; 3895ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 3905ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } else { 3915ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark CaseStmt *CS = cast<CaseStmt>(SC); 3925ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 3935ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // We already verified that the expression has a i-c-e value (C99 3945ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // 6.8.4.2p3) - get that value now. 3955ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Expr *Lo = CS->getLHS(); 3965ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 3975ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (Lo->isTypeDependent() || Lo->isValueDependent()) { 3985ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark HasDependentValue = true; 3995ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark break; 4005ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 4015ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 4025ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark llvm::APSInt LoVal = Lo->EvaluateAsInt(Context); 4035ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 4045ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // Convert the value to the same width/sign as the condition. 4055ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark ConvertIntegerToTypeWarnOnOverflow(LoVal, CondWidth, CondIsSigned, 4065ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark CS->getLHS()->getLocStart(), 4075ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark diag::warn_case_value_overflow); 4085ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 4095ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // If the LHS is not the same type as the condition, insert an implicit 4105ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // cast. 4115ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark ImpCastExprToType(Lo, CondType); 4125ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark CS->setLHS(Lo); 4135ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 4145ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // If this is a case range, remember it in CaseRanges, otherwise CaseVals. 4155ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (CS->getRHS()) { 4165ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (CS->getRHS()->isTypeDependent() || 4175ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark CS->getRHS()->isValueDependent()) { 4185ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark HasDependentValue = true; 4195ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark break; 4205ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 4215ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark CaseRanges.push_back(std::make_pair(LoVal, CS)); 4225ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } else 4235ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark CaseVals.push_back(std::make_pair(LoVal, CS)); 4245ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 4255ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 4265ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 4275ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (!HasDependentValue) { 4285ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // Sort all the scalar case values so we can easily detect duplicates. 4295ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark std::stable_sort(CaseVals.begin(), CaseVals.end(), CmpCaseVals); 4305ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 4315ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (!CaseVals.empty()) { 4325ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark for (unsigned i = 0, e = CaseVals.size()-1; i != e; ++i) { 4335ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (CaseVals[i].first == CaseVals[i+1].first) { 4345ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // If we have a duplicate, report it. 4355ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Diag(CaseVals[i+1].second->getLHS()->getLocStart(), 4365ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark diag::err_duplicate_case) << CaseVals[i].first.toString(10); 4375ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Diag(CaseVals[i].second->getLHS()->getLocStart(), 4385ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark diag::note_duplicate_case_prev); 4395ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // FIXME: We really want to remove the bogus case stmt from the 4405ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // substmt, but we have no way to do this right now. 4415ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark CaseListIsErroneous = true; 4425ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 4435ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 4440bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch } 4450bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch 4460bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // Detect duplicate case ranges, which usually don't exist at all in 4470bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // the first place. 4480bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if (!CaseRanges.empty()) { 4490bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // Sort all the case ranges by their low value so we can easily detect 4500bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // overlaps between ranges. 4510bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch std::stable_sort(CaseRanges.begin(), CaseRanges.end()); 4520bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch 4530bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // Scan the ranges, computing the high values and removing empty ranges. 4540bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch std::vector<llvm::APSInt> HiVals; 4550bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { 4560bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch CaseStmt *CR = CaseRanges[i].second; 4570bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch Expr *Hi = CR->getRHS(); 4580bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch llvm::APSInt HiVal = Hi->EvaluateAsInt(Context); 4590bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch 4600bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // Convert the value to the same width/sign as the condition. 4610bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch ConvertIntegerToTypeWarnOnOverflow(HiVal, CondWidth, CondIsSigned, 4620bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch CR->getRHS()->getLocStart(), 4630bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch diag::warn_case_value_overflow); 4645ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 4655ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // If the LHS is not the same type as the condition, insert an implicit 466563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark // cast. 467563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark ImpCastExprToType(Hi, CondType); 468563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark CR->setRHS(Hi); 469563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark 470563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark // If the low value is bigger than the high value, the case is empty. 471563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark if (CaseRanges[i].first > HiVal) { 472563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark Diag(CR->getLHS()->getLocStart(), diag::warn_case_empty_range) 473563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark << SourceRange(CR->getLHS()->getLocStart(), 4740bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch CR->getRHS()->getLocEnd()); 4750bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch CaseRanges.erase(CaseRanges.begin()+i); 4760bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch --i, --e; 4770bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch continue; 4780bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch } 4790bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch HiVals.push_back(HiVal); 4800bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch } 4810bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch 4820bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // Rescan the ranges, looking for overlap with singleton values and other 4830bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // ranges. Since the range list is sorted, we only need to compare case 4840bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // ranges with their neighbors. 4850bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { 4860bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch llvm::APSInt &CRLo = CaseRanges[i].first; 4870bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch llvm::APSInt &CRHi = HiVals[i]; 4880bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch CaseStmt *CR = CaseRanges[i].second; 4890bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch 4900bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // Check to see whether the case range overlaps with any 491563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark // singleton cases. 492563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark CaseStmt *OverlapStmt = 0; 493563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark llvm::APSInt OverlapVal(32); 494563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark 495563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark // Find the smallest value >= the lower bound. If I is in the 496563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark // case range, then we have overlap. 497563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark CaseValsTy::iterator I = std::lower_bound(CaseVals.begin(), 498563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark CaseVals.end(), CRLo, 499563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark CaseCompareFunctor()); 500563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark if (I != CaseVals.end() && I->first < CRHi) { 501563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark OverlapVal = I->first; // Found overlap with scalar. 502563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark OverlapStmt = I->second; 503563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark } 504563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark 505563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark // Find the smallest value bigger than the upper bound. 506563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark I = std::upper_bound(I, CaseVals.end(), CRHi, CaseCompareFunctor()); 507563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark if (I != CaseVals.begin() && (I-1)->first >= CRLo) { 508563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark OverlapVal = (I-1)->first; // Found overlap with scalar. 509563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark OverlapStmt = (I-1)->second; 510563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark } 511563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark 512563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark // Check to see if this case stmt overlaps with the subsequent 513563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark // case range. 514dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block if (i && CRLo <= HiVals[i-1]) { 515dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block OverlapVal = HiVals[i-1]; // Found overlap with range. 516dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block OverlapStmt = CaseRanges[i-1].second; 517dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block } 518dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block 519dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block if (OverlapStmt) { 520dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block // If we have a duplicate, report it. 521dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block Diag(CR->getLHS()->getLocStart(), diag::err_duplicate_case) 522dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block << OverlapVal.toString(10); 523dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block Diag(OverlapStmt->getLHS()->getLocStart(), 524dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block diag::note_duplicate_case_prev); 525dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block // FIXME: We really want to remove the bogus case stmt from the 526dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block // substmt, but we have no way to do this right now. 527dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block CaseListIsErroneous = true; 528dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block } 529dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block } 5305ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 5315ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 5325ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 5335ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // FIXME: If the case list was broken is some way, we don't have a good system 5345ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // to patch it up. Instead, just return the whole substmt as broken. 5355ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (CaseListIsErroneous) 5365ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return StmtError(); 537692e5dbf12901edacf14812a6fae25462920af42Steve Block 5385ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Switch.release(); 5395ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return Owned(SS); 540692e5dbf12901edacf14812a6fae25462920af42Steve Block} 5415ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 5425ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkAction::OwningStmtResult 5435ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkSema::ActOnWhileStmt(SourceLocation WhileLoc, ExprArg Cond, StmtArg Body) { 5445ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Expr *condExpr = Cond.takeAs<Expr>(); 5455ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark assert(condExpr && "ActOnWhileStmt(): missing expression"); 5465ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 5475ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (!condExpr->isTypeDependent()) { 5485ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark DefaultFunctionArrayConversion(condExpr); 5495ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Cond = condExpr; 5505ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark QualType condType = condExpr->getType(); 5515ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 5525ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (getLangOptions().CPlusPlus) { 5535ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (CheckCXXBooleanCondition(condExpr)) // C++ 6.4p4 5545ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return StmtError(); 5555ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } else if (!condType->isScalarType()) // C99 6.8.5p2 5565ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return StmtError(Diag(WhileLoc, 557692e5dbf12901edacf14812a6fae25462920af42Steve Block diag::err_typecheck_statement_requires_scalar) 558692e5dbf12901edacf14812a6fae25462920af42Steve Block << condType << condExpr->getSourceRange()); 5595ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 5605ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 5615ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Cond.release(); 5625ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return Owned(new (Context) WhileStmt(condExpr, Body.takeAs<Stmt>(), 5635ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark WhileLoc)); 5645ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark} 5655ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 5665ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkAction::OwningStmtResult 5675ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkSema::ActOnDoStmt(SourceLocation DoLoc, StmtArg Body, 5685ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark SourceLocation WhileLoc, ExprArg Cond) { 5695ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Expr *condExpr = Cond.takeAs<Expr>(); 5705ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark assert(condExpr && "ActOnDoStmt(): missing expression"); 5715ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 5725ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (!condExpr->isTypeDependent()) { 5735ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark DefaultFunctionArrayConversion(condExpr); 5745ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Cond = condExpr; 5755ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark QualType condType = condExpr->getType(); 5765ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 5775ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (getLangOptions().CPlusPlus) { 5785ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (CheckCXXBooleanCondition(condExpr)) // C++ 6.4p4 5795ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return StmtError(); 5805ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } else if (!condType->isScalarType()) // C99 6.8.5p2 5815ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return StmtError(Diag(DoLoc, 5825ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark diag::err_typecheck_statement_requires_scalar) 5835ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark << condType << condExpr->getSourceRange()); 5845ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 5855ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 5865ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Cond.release(); 5875ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return Owned(new (Context) DoStmt(Body.takeAs<Stmt>(), condExpr, DoLoc, 5885ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark WhileLoc)); 5895ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark} 5905ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 5915ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkAction::OwningStmtResult 5925ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkSema::ActOnForStmt(SourceLocation ForLoc, SourceLocation LParenLoc, 5935ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark StmtArg first, ExprArg second, ExprArg third, 5945ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark SourceLocation RParenLoc, StmtArg body) { 5955ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Stmt *First = static_cast<Stmt*>(first.get()); 5965ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Expr *Second = static_cast<Expr*>(second.get()); 5975ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Expr *Third = static_cast<Expr*>(third.get()); 5985ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Stmt *Body = static_cast<Stmt*>(body.get()); 5995ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 6005ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (!getLangOptions().CPlusPlus) { 6015ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (DeclStmt *DS = dyn_cast_or_null<DeclStmt>(First)) { 6025ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // C99 6.8.5p3: The declaration part of a 'for' statement shall only 6035ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // declare identifiers for objects having storage class 'auto' or 6045ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // 'register'. 6055ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark for (DeclStmt::decl_iterator DI=DS->decl_begin(), DE=DS->decl_end(); 6065ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark DI!=DE; ++DI) { 6075ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark VarDecl *VD = dyn_cast<VarDecl>(*DI); 6085ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (VD && VD->isBlockVarDecl() && !VD->hasLocalStorage()) 6095ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark VD = 0; 6105ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (VD == 0) 6115ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Diag((*DI)->getLocation(), diag::err_non_variable_decl_in_for); 6125ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // FIXME: mark decl erroneous! 6135ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 6145ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 6155ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 6165ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (Second && !Second->isTypeDependent()) { 6170bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch DefaultFunctionArrayConversion(Second); 6185ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark QualType SecondType = Second->getType(); 6195ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 6205ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (getLangOptions().CPlusPlus) { 6215ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (CheckCXXBooleanCondition(Second)) // C++ 6.4p4 622563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark return StmtError(); 623563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark } else if (!SecondType->isScalarType()) // C99 6.8.5p2 6245ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return StmtError(Diag(ForLoc, 6255ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark diag::err_typecheck_statement_requires_scalar) 6265ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark << SecondType << Second->getSourceRange()); 6275ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 6285ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark first.release(); 6295ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark second.release(); 6305ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark third.release(); 6315ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark body.release(); 6325ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return Owned(new (Context) ForStmt(First, Second, Third, Body, ForLoc, 6335ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark LParenLoc, RParenLoc)); 6345ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark} 6355ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 6365ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkAction::OwningStmtResult 6375ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkSema::ActOnObjCForCollectionStmt(SourceLocation ForLoc, 6385ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark SourceLocation LParenLoc, 6395ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark StmtArg first, ExprArg second, 6405ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark SourceLocation RParenLoc, StmtArg body) { 6415ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Stmt *First = static_cast<Stmt*>(first.get()); 6425ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Expr *Second = static_cast<Expr*>(second.get()); 6435ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Stmt *Body = static_cast<Stmt*>(body.get()); 644563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark if (First) { 645563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark QualType FirstType; 6465ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (DeclStmt *DS = dyn_cast<DeclStmt>(First)) { 647563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark if (!DS->isSingleDecl()) 6485ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return StmtError(Diag((*DS->decl_begin())->getLocation(), 6495ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark diag::err_toomany_element_decls)); 6505ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 6515ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Decl *D = DS->getSingleDecl(); 6525ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark FirstType = cast<ValueDecl>(D)->getType(); 6535ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // C99 6.8.5p3: The declaration part of a 'for' statement shall only 6545ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // declare identifiers for objects having storage class 'auto' or 6555ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // 'register'. 6565ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark VarDecl *VD = cast<VarDecl>(D); 6575ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (VD->isBlockVarDecl() && !VD->hasLocalStorage()) 658d0825bca7fe65beaee391d30da42e937db621564Steve Block return StmtError(Diag(VD->getLocation(), 6595ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark diag::err_non_variable_decl_in_for)); 660d0825bca7fe65beaee391d30da42e937db621564Steve Block } else { 661d0825bca7fe65beaee391d30da42e937db621564Steve Block if (cast<Expr>(First)->isLvalue(Context) != Expr::LV_Valid) 662d0825bca7fe65beaee391d30da42e937db621564Steve Block return StmtError(Diag(First->getLocStart(), 663d0825bca7fe65beaee391d30da42e937db621564Steve Block diag::err_selector_element_not_lvalue) 664d0825bca7fe65beaee391d30da42e937db621564Steve Block << First->getSourceRange()); 665d0825bca7fe65beaee391d30da42e937db621564Steve Block 666d0825bca7fe65beaee391d30da42e937db621564Steve Block FirstType = static_cast<Expr*>(First)->getType(); 667d0825bca7fe65beaee391d30da42e937db621564Steve Block } 668d0825bca7fe65beaee391d30da42e937db621564Steve Block if (!Context.isObjCObjectPointerType(FirstType)) 669d0825bca7fe65beaee391d30da42e937db621564Steve Block Diag(ForLoc, diag::err_selector_element_type) 670d0825bca7fe65beaee391d30da42e937db621564Steve Block << FirstType << First->getSourceRange(); 671d0825bca7fe65beaee391d30da42e937db621564Steve Block } 672d0825bca7fe65beaee391d30da42e937db621564Steve Block if (Second) { 673d0825bca7fe65beaee391d30da42e937db621564Steve Block DefaultFunctionArrayConversion(Second); 674d0825bca7fe65beaee391d30da42e937db621564Steve Block QualType SecondType = Second->getType(); 675d0825bca7fe65beaee391d30da42e937db621564Steve Block if (!Context.isObjCObjectPointerType(SecondType)) 676d0825bca7fe65beaee391d30da42e937db621564Steve Block Diag(ForLoc, diag::err_collection_expr_type) 677d0825bca7fe65beaee391d30da42e937db621564Steve Block << SecondType << Second->getSourceRange(); 678d0825bca7fe65beaee391d30da42e937db621564Steve Block } 679d0825bca7fe65beaee391d30da42e937db621564Steve Block first.release(); 680d0825bca7fe65beaee391d30da42e937db621564Steve Block second.release(); 681d0825bca7fe65beaee391d30da42e937db621564Steve Block body.release(); 682d0825bca7fe65beaee391d30da42e937db621564Steve Block return Owned(new (Context) ObjCForCollectionStmt(First, Second, Body, 683d0825bca7fe65beaee391d30da42e937db621564Steve Block ForLoc, RParenLoc)); 684d0825bca7fe65beaee391d30da42e937db621564Steve Block} 6855ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 6865ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkAction::OwningStmtResult 6875ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkSema::ActOnGotoStmt(SourceLocation GotoLoc, SourceLocation LabelLoc, 6885ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark IdentifierInfo *LabelII) { 6895ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // If we are in a block, reject all gotos for now. 6905ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (CurBlock) 6915ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return StmtError(Diag(GotoLoc, diag::err_goto_in_block)); 6925ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 6930bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // Look up the record for this label identifier. 6945ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark LabelStmt *&LabelDecl = getLabelMap()[LabelII]; 6955ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 6965ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // If we haven't seen this label yet, create a forward reference. 6975ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (LabelDecl == 0) 6985ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark LabelDecl = new (Context) LabelStmt(LabelLoc, LabelII, 0); 6995ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 7005ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return Owned(new (Context) GotoStmt(LabelDecl, GotoLoc, LabelLoc)); 7015ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark} 7025ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 7035ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkAction::OwningStmtResult 7045ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkSema::ActOnIndirectGotoStmt(SourceLocation GotoLoc, SourceLocation StarLoc, 7055ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark ExprArg DestExp) { 7065ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // Convert operand to void* 7075ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Expr* E = DestExp.takeAs<Expr>(); 7085ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (!E->isTypeDependent()) { 7095ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark QualType ETy = E->getType(); 7105ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark AssignConvertType ConvTy = 7115ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark CheckSingleAssignmentConstraints(Context.VoidPtrTy, E); 7125ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (DiagnoseAssignmentResult(ConvTy, StarLoc, Context.VoidPtrTy, ETy, 7135ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark E, "passing")) 7145ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return StmtError(); 7155ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 7165ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return Owned(new (Context) IndirectGotoStmt(GotoLoc, StarLoc, E)); 7175ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark} 7185ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 7195ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkAction::OwningStmtResult 7205ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkSema::ActOnContinueStmt(SourceLocation ContinueLoc, Scope *CurScope) { 721563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark Scope *S = CurScope->getContinueParent(); 7225ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (!S) { 723d0825bca7fe65beaee391d30da42e937db621564Steve Block // C99 6.8.6.2p1: A break shall appear only in or as a loop body. 7245ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return StmtError(Diag(ContinueLoc, diag::err_continue_not_in_loop)); 7255ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 7265ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 7275ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return Owned(new (Context) ContinueStmt(ContinueLoc)); 7285ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark} 729d0825bca7fe65beaee391d30da42e937db621564Steve Block 7305ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkAction::OwningStmtResult 7315ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkSema::ActOnBreakStmt(SourceLocation BreakLoc, Scope *CurScope) { 7320bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch Scope *S = CurScope->getBreakParent(); 7335ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (!S) { 7345ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // C99 6.8.6.3p1: A break shall appear only in or as a switch/loop body. 7355ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return StmtError(Diag(BreakLoc, diag::err_break_not_in_loop_or_switch)); 7365ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 7375ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 7385ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return Owned(new (Context) BreakStmt(BreakLoc)); 7395ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark} 740cac0f67c402d107cdb10971b95719e2ff9c7c76bSteve Block 741cac0f67c402d107cdb10971b95719e2ff9c7c76bSteve Block/// ActOnBlockReturnStmt - Utility routine to figure out block's return type. 7425ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark/// 743cac0f67c402d107cdb10971b95719e2ff9c7c76bSteve BlockAction::OwningStmtResult 7445ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkSema::ActOnBlockReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp) { 7455ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // If this is the first return we've seen in the block, infer the type of 7465ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // the block from it. 7475ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (CurBlock->ReturnType == 0) { 7485ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (RetValExp) { 7495ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // Don't call UsualUnaryConversions(), since we don't want to do 7505ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // integer promotions here. 7515ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark DefaultFunctionArrayConversion(RetValExp); 7525ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark CurBlock->ReturnType = RetValExp->getType().getTypePtr(); 753cac0f67c402d107cdb10971b95719e2ff9c7c76bSteve Block } else 7545ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark CurBlock->ReturnType = Context.VoidTy.getTypePtr(); 7555ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 7565ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark QualType FnRetType = QualType(CurBlock->ReturnType, 0); 7575ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 7585ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (CurBlock->TheDecl->hasAttr<NoReturnAttr>()) { 7595ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Diag(ReturnLoc, diag::err_noreturn_block_has_return_expr) 7605ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark << getCurFunctionOrMethodDecl()->getDeclName(); 7615ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return StmtError(); 7625ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 7635ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 7645ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // Otherwise, verify that this result type matches the previous one. We are 765231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block // pickier with blocks than for normal functions because we don't have GCC 7665ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // compatibility to worry about here. 7675ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (CurBlock->ReturnType->isVoidType()) { 7685ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (RetValExp) { 7695ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Diag(ReturnLoc, diag::err_return_block_has_expr); 770563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark RetValExp->Destroy(Context); 7715ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark RetValExp = 0; 7725ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 7735ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return Owned(new (Context) ReturnStmt(ReturnLoc, RetValExp)); 7745ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 7755ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 7765ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (!RetValExp) 7775ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return StmtError(Diag(ReturnLoc, diag::err_block_return_missing_expr)); 7785ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 7795ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { 7805ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // we have a non-void block with an expression, continue checking 781d0825bca7fe65beaee391d30da42e937db621564Steve Block QualType RetValType = RetValExp->getType(); 782d0825bca7fe65beaee391d30da42e937db621564Steve Block 7835ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // C99 6.8.6.4p3(136): The return statement is not an assignment. The 7845ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // overlap restriction of subclause 6.5.16.1 does not apply to the case of 7855ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // function return. 7865ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 7875e2bc6953fe6923165b8a5d7679939693a1d58d6Steve Block // In C++ the return statement is handled via a copy initialization. 7885ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // the C version of which boils down to CheckSingleAssignmentConstraints. 7895ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // FIXME: Leaks RetValExp. 7905ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (PerformCopyInitialization(RetValExp, FnRetType, "returning")) 7915ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return StmtError(); 7925ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 7935ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (RetValExp) CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); 7945ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 795563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark 7965ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return Owned(new (Context) ReturnStmt(ReturnLoc, RetValExp)); 797563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark} 798dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block 799dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block/// IsReturnCopyElidable - Whether returning @p RetExpr from a function that 800563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark/// returns a @p RetType fulfills the criteria for copy elision (C++0x 12.8p15). 801563af33bc48281d19dce701398dbb88cb54fd7ecCary Clarkstatic bool IsReturnCopyElidable(ASTContext &Ctx, QualType RetType, 802563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark Expr *RetExpr) { 803dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block QualType ExprType = RetExpr->getType(); 804dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block // - in a return statement in a function with ... 805dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block // ... a class return type ... 806dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block if (!RetType->isRecordType()) 807dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block return false; 8085ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // ... the same cv-unqualified type as the function return type ... 809563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark if (Ctx.getCanonicalType(RetType).getUnqualifiedType() != 810563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark Ctx.getCanonicalType(ExprType).getUnqualifiedType()) 811563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark return false; 8125ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // ... the expression is the name of a non-volatile automatic object ... 8135ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // We ignore parentheses here. 8145ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // FIXME: Is this compliant? 8155ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(RetExpr->IgnoreParens()); 8165ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (!DR) 8175ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return false; 8185ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark const VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl()); 8195ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (!VD) 8205ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return false; 821dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block return VD->hasLocalStorage() && !VD->getType()->isReferenceType() 8225ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark && !VD->getType().isVolatileQualified(); 8235ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark} 824692e5dbf12901edacf14812a6fae25462920af42Steve Block 8255ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkAction::OwningStmtResult 8265ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkSema::ActOnReturnStmt(SourceLocation ReturnLoc, ExprArg rex) { 8275ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Expr *RetValExp = rex.takeAs<Expr>(); 828563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark if (CurBlock) 829563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark return ActOnBlockReturnStmt(ReturnLoc, RetValExp); 830563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark 831563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark QualType FnRetType; 832563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark if (const FunctionDecl *FD = getCurFunctionDecl()) { 833563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark FnRetType = FD->getResultType(); 8345ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (FD->hasAttr<NoReturnAttr>()) { 835563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark Diag(ReturnLoc, diag::err_noreturn_function_has_return_expr) 836692e5dbf12901edacf14812a6fae25462920af42Steve Block << getCurFunctionOrMethodDecl()->getDeclName(); 837563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark return StmtError(); 838563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark } 839563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark } else if (ObjCMethodDecl *MD = getCurMethodDecl()) 840563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark FnRetType = MD->getResultType(); 841563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark else // If we don't have a function/method context, bail. 842563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark return StmtError(); 843692e5dbf12901edacf14812a6fae25462920af42Steve Block 8445ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (FnRetType->isVoidType()) { 845692e5dbf12901edacf14812a6fae25462920af42Steve Block if (RetValExp) {// C99 6.8.6.4p1 (ext_ since GCC warns) 8465ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark unsigned D = diag::ext_return_has_expr; 8475ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (RetValExp->getType()->isVoidType()) 8480bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch D = diag::ext_return_has_void_expr; 8495ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 8505ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // return (some void expression); is legal in C++. 8515ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (D != diag::ext_return_has_void_expr || 8525ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark !getLangOptions().CPlusPlus) { 853ca9cb53ed1119a3fd98fafa0972ffeb56dee1c24Steve Block NamedDecl *CurDecl = getCurFunctionOrMethodDecl(); 854ca9cb53ed1119a3fd98fafa0972ffeb56dee1c24Steve Block Diag(ReturnLoc, D) 855ca9cb53ed1119a3fd98fafa0972ffeb56dee1c24Steve Block << CurDecl->getDeclName() << isa<ObjCMethodDecl>(CurDecl) 856dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block << RetValExp->getSourceRange(); 857dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block } 8585ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 859dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block return Owned(new (Context) ReturnStmt(ReturnLoc, RetValExp)); 8605ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 8615ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 8625ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (!RetValExp && !FnRetType->isDependentType()) { 8635ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark unsigned DiagID = diag::warn_return_missing_expr; // C90 6.6.6.4p4 864563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark // C99 6.8.6.4p1 (ext_ since GCC warns) 8650bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if (getLangOptions().C99) DiagID = diag::ext_return_missing_expr; 8665ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 867cac0f67c402d107cdb10971b95719e2ff9c7c76bSteve Block if (FunctionDecl *FD = getCurFunctionDecl()) 868563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark Diag(ReturnLoc, DiagID) << FD->getIdentifier() << 0/*fn*/; 869563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark else 8700bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch Diag(ReturnLoc, DiagID) << getCurMethodDecl()->getDeclName() << 1/*meth*/; 8710bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch return Owned(new (Context) ReturnStmt(ReturnLoc, (Expr*)0)); 8720bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch } 873563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark 874563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { 875563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark // we have a non-void function with an expression, continue checking 876563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark 8770bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // C99 6.8.6.4p3(136): The return statement is not an assignment. The 8780bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // overlap restriction of subclause 6.5.16.1 does not apply to the case of 8795ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // function return. 8800bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch 881563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark // C++0x 12.8p15: When certain criteria are met, an implementation is 882563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark // allowed to omit the copy construction of a class object, [...] 883563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark // - in a return statement in a function with a class return type, when 884563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark // the expression is the name of a non-volatile automatic object with 885563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark // the same cv-unqualified type as the function return type, the copy 886563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark // operation can be omitted [...] 887563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark // C++0x 12.8p16: When the criteria for elision of a copy operation are met 8885ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // and the object to be copied is designated by an lvalue, overload 8895ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // resolution to select the constructor for the copy is first performed 8905ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // as if the object were designated by an rvalue. 8915ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // Note that we only compute Elidable if we're in C++0x, since we don't 8925ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // care otherwise. 8935ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark bool Elidable = getLangOptions().CPlusPlus0x ? 8945ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark IsReturnCopyElidable(Context, FnRetType, RetValExp) : 8955ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark false; 8965ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 8970bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // In C++ the return statement is handled via a copy initialization. 8980bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // the C version of which boils down to CheckSingleAssignmentConstraints. 8990bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // FIXME: Leaks RetValExp on error. 900692e5dbf12901edacf14812a6fae25462920af42Steve Block if (PerformCopyInitialization(RetValExp, FnRetType, "returning", Elidable)) 901dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block return StmtError(); 902dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block 9035ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (RetValExp) CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); 904dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block } 9055ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 9065ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return Owned(new (Context) ReturnStmt(ReturnLoc, RetValExp)); 9075ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark} 9085ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 9095ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark/// CheckAsmLValue - GNU C has an extremely ugly extension whereby they silently 910cac0f67c402d107cdb10971b95719e2ff9c7c76bSteve Block/// ignore "noop" casts in places where an lvalue is required by an inline asm. 9110bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch/// We emulate this behavior when -fheinous-gnu-extensions is specified, but 9120bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch/// provide a strong guidance to not use it. 9135ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark/// 914545e470e52f0ac6a3a072bf559c796b42c6066b6Ben Murdoch/// This method checks to see if the argument is an acceptable l-value and 9155ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark/// returns false if it is a case we can handle. 9165ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clarkstatic bool CheckAsmLValue(const Expr *E, Sema &S) { 9170bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if (E->isLvalue(S.Context) == Expr::LV_Valid) 9180bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch return false; // Cool, this is an lvalue. 9195ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 9205ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // Okay, this is not an lvalue, but perhaps it is the result of a cast that we 921cac0f67c402d107cdb10971b95719e2ff9c7c76bSteve Block // are supposed to allow. 922563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark const Expr *E2 = E->IgnoreParenNoopCasts(S.Context); 9230bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if (E != E2 && E2->isLvalue(S.Context) == Expr::LV_Valid) { 924563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark if (!S.getLangOptions().HeinousExtensions) 9255ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark S.Diag(E2->getLocStart(), diag::err_invalid_asm_cast_lvalue) 9265ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark << E->getSourceRange(); 9275ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark else 9285ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark S.Diag(E2->getLocStart(), diag::warn_invalid_asm_cast_lvalue) 9295ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark << E->getSourceRange(); 9305ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // Accept, even if we emitted an error diagnostic. 9315ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return false; 9325ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 9330bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch 9340bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // None of the above, just randomly invalid non-lvalue. 9350bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch return true; 936692e5dbf12901edacf14812a6fae25462920af42Steve Block} 937dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block 938dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block 9395ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkSema::OwningStmtResult Sema::ActOnAsmStmt(SourceLocation AsmLoc, 940dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block bool IsSimple, 9415ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark bool IsVolatile, 9425ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark unsigned NumOutputs, 9435ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark unsigned NumInputs, 9445ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark std::string *Names, 9455ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark MultiExprArg constraints, 946cac0f67c402d107cdb10971b95719e2ff9c7c76bSteve Block MultiExprArg exprs, 9470bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch ExprArg asmString, 9485ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark MultiExprArg clobbers, 9495ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark SourceLocation RParenLoc) { 9505ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark unsigned NumClobbers = clobbers.size(); 9515ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark StringLiteral **Constraints = 9520bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch reinterpret_cast<StringLiteral**>(constraints.get()); 9530bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch Expr **Exprs = reinterpret_cast<Expr **>(exprs.get()); 9545ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark StringLiteral *AsmString = cast<StringLiteral>((Expr *)asmString.get()); 9555ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark StringLiteral **Clobbers = reinterpret_cast<StringLiteral**>(clobbers.get()); 956cac0f67c402d107cdb10971b95719e2ff9c7c76bSteve Block 957563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark llvm::SmallVector<TargetInfo::ConstraintInfo, 4> OutputConstraintInfos; 9580bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch 959563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark // The parser verifies that there is a string literal here. 9605ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (AsmString->isWide()) 9615ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return StmtError(Diag(AsmString->getLocStart(),diag::err_asm_wide_character) 9625ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark << AsmString->getSourceRange()); 9635ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 9645ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark for (unsigned i = 0; i != NumOutputs; i++) { 9655ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark StringLiteral *Literal = Constraints[i]; 9665ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (Literal->isWide()) 9675ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 9680bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch << Literal->getSourceRange()); 9690bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch 9700bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch TargetInfo::ConstraintInfo Info(Literal->getStrData(), 971692e5dbf12901edacf14812a6fae25462920af42Steve Block Literal->getByteLength(), 972dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block Names[i]); 973dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block if (!Context.Target.validateOutputConstraint(Info)) 9745ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return StmtError(Diag(Literal->getLocStart(), 975dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block diag::err_asm_invalid_output_constraint) 9765ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark << Info.getConstraintStr()); 9775ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 9785ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // Check that the output exprs are valid lvalues. 9795ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Expr *OutputExpr = Exprs[i]; 9805ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (CheckAsmLValue(OutputExpr, *this)) { 981cac0f67c402d107cdb10971b95719e2ff9c7c76bSteve Block return StmtError(Diag(OutputExpr->getLocStart(), 9820bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch diag::err_asm_invalid_lvalue_in_output) 9835ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark << OutputExpr->getSourceRange()); 9845ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 9855ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 9865ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark OutputConstraintInfos.push_back(Info); 9875ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 9880bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch 9890bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch llvm::SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos; 9905ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 9915ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark for (unsigned i = NumOutputs, e = NumOutputs + NumInputs; i != e; i++) { 992cac0f67c402d107cdb10971b95719e2ff9c7c76bSteve Block StringLiteral *Literal = Constraints[i]; 993563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark if (Literal->isWide()) 9940bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 995563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark << Literal->getSourceRange()); 9965ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 9975ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark TargetInfo::ConstraintInfo Info(Literal->getStrData(), 9985ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Literal->getByteLength(), 9995ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Names[i]); 10005ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (!Context.Target.validateInputConstraint(&OutputConstraintInfos[0], 10015ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark NumOutputs, Info)) { 10025ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return StmtError(Diag(Literal->getLocStart(), 10035ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark diag::err_asm_invalid_input_constraint) 10040bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch << Info.getConstraintStr()); 10050bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch } 10060bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch 1007692e5dbf12901edacf14812a6fae25462920af42Steve Block Expr *InputExpr = Exprs[i]; 1008dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block 1009dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block // Only allow void types for memory constraints. 10105ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (Info.allowsMemory() && !Info.allowsRegister()) { 1011dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block if (CheckAsmLValue(InputExpr, *this)) 10125ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return StmtError(Diag(InputExpr->getLocStart(), 10135ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark diag::err_asm_invalid_lvalue_in_input) 10145ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark << Info.getConstraintStr() 10155ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark << InputExpr->getSourceRange()); 10165ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 1017cac0f67c402d107cdb10971b95719e2ff9c7c76bSteve Block 10180bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if (Info.allowsRegister()) { 10190bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if (InputExpr->getType()->isVoidType()) { 10205ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return StmtError(Diag(InputExpr->getLocStart(), 10215ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark diag::err_asm_invalid_type_in_input) 10225ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark << InputExpr->getType() << Info.getConstraintStr() 10235ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark << InputExpr->getSourceRange()); 10245ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 10255ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 10265ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 10275ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark DefaultFunctionArrayConversion(Exprs[i]); 1028692e5dbf12901edacf14812a6fae25462920af42Steve Block 1029dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block InputConstraintInfos.push_back(Info); 1030dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block } 10315ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 1032dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block // Check that the clobbers are valid. 10335ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark for (unsigned i = 0; i != NumClobbers; i++) { 10345ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark StringLiteral *Literal = Clobbers[i]; 10355ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (Literal->isWide()) 10365ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 10375ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark << Literal->getSourceRange()); 1038cac0f67c402d107cdb10971b95719e2ff9c7c76bSteve Block 10390bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch llvm::SmallString<16> Clobber(Literal->getStrData(), 10400bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch Literal->getStrData() + 10415ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Literal->getByteLength()); 10425ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 10435ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (!Context.Target.isValidGCCRegisterName(Clobber.c_str())) 10445ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return StmtError(Diag(Literal->getLocStart(), 10455ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark diag::err_asm_unknown_register_name) << Clobber.c_str()); 10465ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 10475ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 10485ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark constraints.release(); 10490bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch exprs.release(); 10500bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch asmString.release(); 10510bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch clobbers.release(); 1052692e5dbf12901edacf14812a6fae25462920af42Steve Block AsmStmt *NS = 1053dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block new (Context) AsmStmt(AsmLoc, IsSimple, IsVolatile, NumOutputs, NumInputs, 1054dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block Names, Constraints, Exprs, AsmString, NumClobbers, 10555ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Clobbers, RParenLoc); 1056dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block // Validate the asm string, ensuring it makes sense given the operands we 10575ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // have. 10585ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark llvm::SmallVector<AsmStmt::AsmStringPiece, 8> Pieces; 10595ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark unsigned DiagOffs; 10605ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (unsigned DiagID = NS->AnalyzeAsmString(Pieces, Context, DiagOffs)) { 10615ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Diag(getLocationOfStringLiteralByte(AsmString, DiagOffs), DiagID) 1062cac0f67c402d107cdb10971b95719e2ff9c7c76bSteve Block << AsmString->getSourceRange(); 10630bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch DeleteStmt(NS); 10645ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return StmtError(); 10650bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch } 10665ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 10675ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // Validate tied input operands for type mismatches. 10685ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark for (unsigned i = 0, e = InputConstraintInfos.size(); i != e; ++i) { 10695ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i]; 10705ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 10715ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // If this is a tied constraint, verify that the output and input have 10725ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // either exactly the same type, or that they are int/ptr operands with the 10735ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // same size (int/long, int*/long, are ok etc). 10745ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (!Info.hasTiedOperand()) continue; 10750bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch 10760bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch unsigned TiedTo = Info.getTiedOperand(); 10770bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch Expr *OutputExpr = Exprs[TiedTo]; 1078692e5dbf12901edacf14812a6fae25462920af42Steve Block Expr *InputExpr = Exprs[i+NumOutputs]; 1079dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block QualType InTy = InputExpr->getType(); 1080dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block QualType OutTy = OutputExpr->getType(); 10815ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (Context.hasSameType(InTy, OutTy)) 1082dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block continue; // All types can be tied to themselves. 10835ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 10845ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // Int/ptr operands have some special cases that we allow. 10855ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if ((OutTy->isIntegerType() || OutTy->isPointerType()) && 10865ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark (InTy->isIntegerType() || InTy->isPointerType())) { 10875ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 1088cac0f67c402d107cdb10971b95719e2ff9c7c76bSteve Block // They are ok if they are the same size. Tying void* to int is ok if 10890bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // they are the same size, for example. This also allows tying void* to 10905ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // int*. 10910bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch uint64_t OutSize = Context.getTypeSize(OutTy); 10925ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark uint64_t InSize = Context.getTypeSize(InTy); 10935ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (OutSize == InSize) 10945ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark continue; 10955ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 10965ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // If the smaller input/output operand is not mentioned in the asm string, 10975ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // then we can promote it and the asm string won't notice. Check this 10985ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // case now. 10995ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark bool SmallerValueMentioned = false; 11000bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch for (unsigned p = 0, e = Pieces.size(); p != e; ++p) { 11010bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch AsmStmt::AsmStringPiece &Piece = Pieces[p]; 11020bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if (!Piece.isOperand()) continue; 1103692e5dbf12901edacf14812a6fae25462920af42Steve Block 1104dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block // If this is a reference to the input and if the input was the smaller 1105dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block // one, then we have to reject this asm. 11065ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (Piece.getOperandNo() == i+NumOutputs) { 1107dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block if (InSize < OutSize) { 11085ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark SmallerValueMentioned = true; 11095ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark break; 11105ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 11115ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 11125ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 1113cac0f67c402d107cdb10971b95719e2ff9c7c76bSteve Block // If this is a reference to the input and if the input was the smaller 11145ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // one, then we have to reject this asm. 11155ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (Piece.getOperandNo() == TiedTo) { 11165ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (InSize > OutSize) { 11175ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark SmallerValueMentioned = true; 11185ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark break; 11190bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch } 11205ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 11215ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 11225ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 11235ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // If the smaller value wasn't mentioned in the asm string, and if the 11245ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // output was a register, just extend the shorter one to the size of the 11255ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // larger one. 11265ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (!SmallerValueMentioned && 11270bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch OutputConstraintInfos[TiedTo].allowsRegister()) 11280bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch continue; 11290bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch } 1130692e5dbf12901edacf14812a6fae25462920af42Steve Block 1131dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block Diag(InputExpr->getLocStart(), 1132dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block diag::err_asm_tying_incompatible_types) 11335ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark << InTy << OutTy << OutputExpr->getSourceRange() 1134dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block << InputExpr->getSourceRange(); 11355ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark DeleteStmt(NS); 11365ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return StmtError(); 11375ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } 11385ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 11395ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return Owned(NS); 1140cac0f67c402d107cdb10971b95719e2ff9c7c76bSteve Block} 11415ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 11425ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkAction::OwningStmtResult 11435ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkSema::ActOnObjCAtCatchStmt(SourceLocation AtLoc, 11445ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark SourceLocation RParen, DeclPtrTy Parm, 11455ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark StmtArg Body, StmtArg catchList) { 11460bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch Stmt *CatchList = catchList.takeAs<Stmt>(); 11475ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark ParmVarDecl *PVD = cast_or_null<ParmVarDecl>(Parm.getAs<Decl>()); 11485ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 11495ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // PVD == 0 implies @catch(...). 11505ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (PVD) { 11515ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // If we already know the decl is invalid, reject it. 11525ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (PVD->isInvalidDecl()) 11535ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return StmtError(); 11540bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch 11550bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if (!Context.isObjCObjectPointerType(PVD->getType())) 11560bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch return StmtError(Diag(PVD->getLocation(), 1157692e5dbf12901edacf14812a6fae25462920af42Steve Block diag::err_catch_param_not_objc_type)); 1158dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block if (PVD->getType()->isObjCQualifiedIdType()) 1159dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block return StmtError(Diag(PVD->getLocation(), 11605ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark diag::err_illegal_qualifiers_on_catch_parm)); 1161dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block } 11625ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 11635ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark ObjCAtCatchStmt *CS = new (Context) ObjCAtCatchStmt(AtLoc, RParen, 11645ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark PVD, Body.takeAs<Stmt>(), CatchList); 11655ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return Owned(CatchList ? CatchList : CS); 11665ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark} 1167cac0f67c402d107cdb10971b95719e2ff9c7c76bSteve Block 11685ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkAction::OwningStmtResult 11695ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkSema::ActOnObjCAtFinallyStmt(SourceLocation AtLoc, StmtArg Body) { 11705ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return Owned(new (Context) ObjCAtFinallyStmt(AtLoc, 11715ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark static_cast<Stmt*>(Body.release()))); 11725ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark} 11735ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 11745ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkAction::OwningStmtResult 11755ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkSema::ActOnObjCAtTryStmt(SourceLocation AtLoc, 11760bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch StmtArg Try, StmtArg Catch, StmtArg Finally) { 11770bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch CurFunctionNeedsScopeChecking = true; 11780bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch return Owned(new (Context) ObjCAtTryStmt(AtLoc, Try.takeAs<Stmt>(), 1179692e5dbf12901edacf14812a6fae25462920af42Steve Block Catch.takeAs<Stmt>(), 1180dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block Finally.takeAs<Stmt>())); 1181dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block} 11825ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 1183dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve BlockAction::OwningStmtResult 11845ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkSema::ActOnObjCAtThrowStmt(SourceLocation AtLoc, ExprArg expr,Scope *CurScope) { 11855ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Expr *ThrowExpr = expr.takeAs<Expr>(); 11865ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (!ThrowExpr) { 11875ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // @throw without an expression designates a rethrow (which much occur 11885ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // in the context of an @catch clause). 1189cac0f67c402d107cdb10971b95719e2ff9c7c76bSteve Block Scope *AtCatchParent = CurScope; 11905ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark while (AtCatchParent && !AtCatchParent->isAtCatchScope()) 11915ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark AtCatchParent = AtCatchParent->getParent(); 11925ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (!AtCatchParent) 11935ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return StmtError(Diag(AtLoc, diag::error_rethrow_used_outside_catch)); 11945ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark } else { 11955ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark QualType ThrowType = ThrowExpr->getType(); 11965ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark // Make sure the expression type is an ObjC pointer or "void *". 11975ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (!Context.isObjCObjectPointerType(ThrowType)) { 11980bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch const PointerType *PT = ThrowType->getAsPointerType(); 11990bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if (!PT || !PT->getPointeeType()->isVoidType()) 12000bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch return StmtError(Diag(AtLoc, diag::error_objc_throw_expects_object) 1201692e5dbf12901edacf14812a6fae25462920af42Steve Block << ThrowExpr->getType() << ThrowExpr->getSourceRange()); 1202dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block } 1203dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block } 12045ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return Owned(new (Context) ObjCAtThrowStmt(AtLoc, ThrowExpr)); 1205dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block} 12065ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark 12075ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkAction::OwningStmtResult 12085ec837f49e9c57d4394ce64b853fd86269c8b340Cary ClarkSema::ActOnObjCAtSynchronizedStmt(SourceLocation AtLoc, ExprArg SynchExpr, 12095ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark StmtArg SynchBody) { 12105ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark CurFunctionNeedsScopeChecking = true; 1211cac0f67c402d107cdb10971b95719e2ff9c7c76bSteve Block 12120bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // Make sure the expression type is an ObjC pointer or "void *". 12130bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch Expr *SyncExpr = static_cast<Expr*>(SynchExpr.get()); 12145ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (!Context.isObjCObjectPointerType(SyncExpr->getType())) { 12155ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark const PointerType *PT = SyncExpr->getType()->getAsPointerType(); 12165ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark if (!PT || !PT->getPointeeType()->isVoidType()) 12175ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return StmtError(Diag(AtLoc, diag::error_objc_synchronized_expects_object) 1218563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark << SyncExpr->getType() << SyncExpr->getSourceRange()); 1219563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark } 12200bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch 12210bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch return Owned(new (Context) ObjCAtSynchronizedStmt(AtLoc, 12220bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch SynchExpr.takeAs<Stmt>(), 1223692e5dbf12901edacf14812a6fae25462920af42Steve Block SynchBody.takeAs<Stmt>())); 1224dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block} 1225dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block 1226563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark/// ActOnCXXCatchBlock - Takes an exception declaration and a handler block 1227dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block/// and creates a proper catch handler from them. 1228563af33bc48281d19dce701398dbb88cb54fd7ecCary ClarkAction::OwningStmtResult 1229563af33bc48281d19dce701398dbb88cb54fd7ecCary ClarkSema::ActOnCXXCatchBlock(SourceLocation CatchLoc, DeclPtrTy ExDecl, 1230563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark StmtArg HandlerBlock) { 1231563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark // There's nothing to test that ActOnExceptionDecl didn't already test. 1232563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark return Owned(new (Context) CXXCatchStmt(CatchLoc, 1233cac0f67c402d107cdb10971b95719e2ff9c7c76bSteve Block cast_or_null<VarDecl>(ExDecl.getAs<Decl>()), 12340bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch HandlerBlock.takeAs<Stmt>())); 1235563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark} 1236563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark 1237563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark/// ActOnCXXTryBlock - Takes a try compound-statement and a number of 1238231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block/// handlers and creates a try statement from them. 1239231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve BlockAction::OwningStmtResult 1240563af33bc48281d19dce701398dbb88cb54fd7ecCary ClarkSema::ActOnCXXTryBlock(SourceLocation TryLoc, StmtArg TryBlock, 1241f486d19d62f1bc33246748b14b14a9dfa617b57fIain Merrick MultiStmtArg RawHandlers) { 1242563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark unsigned NumHandlers = RawHandlers.size(); 1243231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block assert(NumHandlers > 0 && 1244563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark "The parser shouldn't call this if there are no handlers."); 1245563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark Stmt **Handlers = reinterpret_cast<Stmt**>(RawHandlers.get()); 1246231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block 1247563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark for(unsigned i = 0; i < NumHandlers - 1; ++i) { 1248231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block CXXCatchStmt *Handler = llvm::cast<CXXCatchStmt>(Handlers[i]); 1249563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark if (!Handler->getExceptionDecl()) 1250563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark return StmtError(Diag(Handler->getLocStart(), diag::err_early_catch_all)); 1251231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block } 1252563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark // FIXME: We should detect handlers for the same type as an earlier one. 1253231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block // This one is rather easy. 1254563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark // FIXME: We should detect handlers that cannot catch anything because an 1255563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark // earlier handler catches a superclass. Need to find a method that is not 1256563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark // quadratic for this. 1257563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark // Neither of these are explicitly forbidden, but every compiler detects them 1258563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark // and warns. 12590bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch 12605ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark CurFunctionNeedsScopeChecking = true; 12610bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch RawHandlers.release(); 12625ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark return Owned(new (Context) CXXTryStmt(TryLoc, 12635ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark static_cast<Stmt*>(TryBlock.release()), 12645ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark Handlers, NumHandlers)); 1265dcc8cf2e65d1aa555cce12431a16547e66b469eeSteve Block} 12665ec837f49e9c57d4394ce64b853fd86269c8b340Cary Clark